| Parameter |
Value |
| Designation |
C/2006 M4 (SWAN) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2006-09-28T17:29:02.883840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:58Z |
| Obs used |
1265 |
| NEO |
- |
| M1 |
11.000 |
| K1 |
7.250 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2006-11-10.0000000 |
| e |
1.00018505 |
| q (au) |
0.783008 |
| a (au) |
-4231.355299 |
| i (deg) |
111.823262 |
| Ω (om, deg) |
148.726842 |
| ω (w, deg) |
62.594371 |
| M (ma, deg) |
0.000151 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.701 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.701 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
10.000 |
| Parameter |
Symbol |
Range |
Description |
| Absolute magnitude at 1 AU from Sun and Earth |
H0 |
-5 to 20 |
Intrinsic brightness of the comet |
| Photometric slope parameter |
n |
2 to 6 |
Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor |
gf |
0.8 to 1 |
Degree of forward scattering |
| Backward scattering asymmetry factor |
gb |
-1 to -0.5 |
Degree of backward scattering |
| Partitioning coefficient |
k |
0.8 to 1 |
Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio |
δ90 |
1 to 10 |
Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
22:01:07.01 |
-57:24:41.1 |
HIP 108832 |
16.55 |
| 2026-03-26 12:00 |
22:01:11.13 |
-57:24:52.5 |
HIP 108832 |
16.19 |
| 2026-03-27 00:00 |
22:01:15.22 |
-57:25:04.3 |
HIP 108832 |
15.85 |
| 2026-03-27 12:00 |
22:01:19.29 |
-57:25:16.2 |
HIP 108832 |
15.53 |
| 2026-03-28 00:00 |
22:01:23.33 |
-57:25:28.5 |
HIP 108832 |
15.23 |
| 2026-03-28 12:00 |
22:01:27.35 |
-57:25:41.0 |
HIP 108832 |
14.95 |
| 2026-03-29 00:00 |
22:01:31.34 |
-57:25:53.7 |
HIP 108832 |
14.69 |
| 2026-03-29 12:00 |
22:01:35.30 |
-57:26:06.8 |
HIP 108832 |
14.46 |
| 2026-03-30 00:00 |
22:01:39.24 |
-57:26:20.0 |
HIP 108832 |
14.25 |
| 2026-03-30 12:00 |
22:01:43.15 |
-57:26:33.6 |
HIP 108832 |
14.07 |
| 2026-03-31 00:00 |
22:01:47.03 |
-57:26:47.4 |
HIP 108832 |
13.92 |
| 2026-03-31 12:00 |
22:01:50.88 |
-57:27:01.4 |
HIP 108832 |
13.80 |
| 2026-04-01 00:00 |
22:01:54.71 |
-57:27:15.8 |
HIP 108832 |
13.70 |
| 2026-04-01 12:00 |
22:01:58.51 |
-57:27:30.3 |
HIP 108832 |
13.63 |
| 2026-04-02 00:00 |
22:02:02.28 |
-57:27:45.1 |
HIP 108832 |
13.59 |
| 2026-04-02 12:00 |
22:02:06.02 |
-57:28:00.2 |
HIP 108832 |
13.58 |
| 2026-04-03 00:00 |
22:02:09.73 |
-57:28:15.6 |
HIP 108832 |
13.60 |
| 2026-04-03 12:00 |
22:02:13.41 |
-57:28:31.1 |
HIP 108832 |
13.65 |
| 2026-04-04 00:00 |
22:02:17.06 |
-57:28:47.0 |
HIP 108832 |
13.72 |
| 2026-04-04 12:00 |
22:02:20.68 |
-57:29:03.1 |
HIP 108832 |
13.83 |
| 2026-04-05 00:00 |
22:02:24.27 |
-57:29:19.4 |
HIP 108832 |
13.96 |
| 2026-04-05 12:00 |
22:02:27.84 |
-57:29:36.0 |
HIP 108832 |
14.11 |
| 2026-04-06 00:00 |
22:02:31.37 |
-57:29:52.8 |
HIP 108832 |
14.29 |
| 2026-04-06 12:00 |
22:02:34.87 |
-57:30:09.9 |
HIP 108832 |
14.49 |
| 2026-04-07 00:00 |
22:02:38.34 |
-57:30:27.3 |
HIP 108832 |
14.72 |
| 2026-04-07 12:00 |
22:02:41.78 |
-57:30:44.8 |
HIP 108832 |
14.97 |
| 2026-04-08 00:00 |
22:02:45.19 |
-57:31:02.7 |
HIP 108832 |
15.23 |
| 2026-04-08 12:00 |
22:02:48.56 |
-57:31:20.7 |
HIP 108832 |
15.52 |
| 2026-04-09 00:00 |
22:02:51.91 |
-57:31:39.0 |
HIP 108832 |
15.82 |
| 2026-04-09 12:00 |
22:02:55.22 |
-57:31:57.6 |
HIP 108832 |
16.14 |
| 2026-04-10 00:00 |
22:02:58.50 |
-57:32:16.4 |
HIP 108832 |
16.48 |
| 2026-04-10 12:00 |
22:03:01.75 |
-57:32:35.4 |
HIP 108832 |
16.83 |
| 2026-04-11 00:00 |
22:03:04.96 |
-57:32:54.7 |
HIP 108832 |
17.19 |
| 2026-04-11 12:00 |
22:03:08.14 |
-57:33:14.2 |
HIP 108832 |
17.57 |
| 2026-04-12 00:00 |
22:03:11.29 |
-57:33:34.0 |
HIP 108832 |
17.95 |
| 2026-04-12 12:00 |
22:03:14.40 |
-57:33:53.9 |
HIP 108832 |
18.35 |
| 2026-04-13 00:00 |
22:03:17.48 |
-57:34:14.2 |
HIP 108832 |
18.76 |
| 2026-04-13 12:00 |
22:03:20.53 |
-57:34:34.6 |
HIP 108832 |
19.18 |
| 2026-04-14 00:00 |
22:03:23.54 |
-57:34:55.3 |
HIP 108832 |
19.60 |
| 2026-04-14 12:00 |
22:03:26.52 |
-57:35:16.2 |
HIP 108832 |
20.03 |
| 2026-04-15 00:00 |
22:03:29.46 |
-57:35:37.4 |
HIP 108832 |
20.47 |
| 2026-04-15 12:00 |
22:03:32.36 |
-57:35:58.8 |
HIP 108832 |
20.92 |
| 2026-04-16 00:00 |
22:03:35.24 |
-57:36:20.4 |
HIP 108832 |
21.37 |